Radius-in-image dependent detector row filtering for windmill artifact reduction

a detector row and windmill technology, applied in tomography, instruments, applications, etc., can solve the problems of aliasing artifacts in reconstructed images, insufficient sampling intervals in the z-axis (detector row) direction, and data size double the size of current us
US20050226365A1Inactive Publication Date: 2005-10-13KK TOSHIBA +1
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Patent Information

Authority / Receiving Office
US Ā· United States
Current Assignee / Owner
KK TOSHIBA
Publication Date
2005-10-13
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

A method, X-ray CT apparatus, and computer program product for obtaining data from a computed tomography (CT) scan, wherein projection data are obtained from at least two detector rows in a CT system, the projection data are filtered in a direction of the at least two detector rows to obtain filtered data in which windmill artifacts are reduced, and the filtered data are reconstructed.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] Multi-slice x-ray computer tomography (CT) systems were developed and introduced into the medical market around 1998. The number of slices generally ranges from 2 to 40 currently, and is expected to increase to 64 or even 256. (See Y. Saito, H. Aradate, H. Miyazaki, K. Igarashi, and H. Ide, ā€œDevelopment of a Large Area 2-dimensional Detector for Real-Time 3-dimensional CT (4D-CT),ā€Radiology vol. 217 (P), 405 (2000); Y. Saito, H. Aradate, H. Miyazaki, K. Igarashi, and H. Ide, ā€œLarge Area Two-Dimensional Detector System for Real-Time Three-Dimensional CT (4D-CT),ā€Proc. of SPIE Med. Imag. Conf., 4320, 775-782 (2001); and http: / / www3.toshiba.co.jp / medical / 4d-ct / , the contents of each of which are herein incorporated by reference). One cone-beam image reconstruction algorithm with helical scanning for CT systems uses a generalized weighted version of Feldkamp reconstruction algorithm, which introduces a flexible focus or...

Claims

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